Combination gas and oil burner



W. W. STEVENSON AND 0. H. BAT HGATE.

COMBINATION GAS AND OIL BURNER.

APPLICATION FILED APR. 5, 191a.

1 $06,238. Patented Feb. 14, 1922.

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UNITED STATES PATENT OFFICE.

WILDQ'B W. 8TH AND OWEN K. BATHGLTE, OF WILKINSBUBB, PENNSYLVANIA, LBSIGITOBB 1'0 mom OOIPANY, 0! LONG ISLAND CITY, NEW YORK, A, 60330.

Specification of Letters Patent.

OOIBDTA'I'IOH GAS AND 011 BURNER.

Patented Feb. 14, 1922.

Application fled April 5, 1918. Serial N0. 228,871.

fuel burners and more particularly to burn-,

ers of the externally mixing low ressure air type, viz. burners in which the uel and the air do not meet until they are ejected from the burner and it is the articular object of this invention to provi e a burner of. this class with such attachments as to enable the burner to use either liquid fuel or gas, should such exigency arise.

Other objects of our invention will appear in the following specification in which a pre'ferred form of our fuel burner is described.

The invention is illustrated by the aid of the accompanying drawing in which Fig. 1 is a vertical longitudinal, sectional view of our improved burner;

Fig. 2 is a transverse cross sectional view taken along the plane of line 2-2 in Fig. 1, and

Fig. 3 a plan view of a cap forming part of the burner.

Like characters of reference denote similar parts throughout the several views and the following specification.

Our device consists, broadly speaking, of a burner of the low pressureair type means for shutting off the liquid fuel supply, and a connection to the interior of the burner for the purpose of admittin gas, and means to discharge the same at out ct of the burner as will now be more fully explained.

10 is a cylindrical'casing of substantially L shape; its shorter branch 11 is threaded interiorly to receive an air supply pipe 12. The terminal of the longer branch 13 of casing 10 is threaded exteriorly at 14. A tubular chamber 15 formed by wall 16 extends through the casing 10 in axial alignment with its longer branch 13. Wall 16 connects the chamber 15 with the outer wall of casing 10 opposite its shorter branch 11 and is threaded interiorl for connection with a gas supply pipe 1 Casing 1 0-is bored out, adjacent to branch 11, to rece 1ve what will be called hereafter an oil spindle 18. This oil spindle is of hollow construction being provided with a central duct 19, and extends through the tubular chamber 15 in central alignment therewith. 20 is an enlarged upper end of spindle 18 threaded internally to receive a spra plug 21 of the usual design employed wit the low pressure air, externally atomizing o1l burner. 22 is a cap screwed onto the extenor of .the wall 16 and contacts with the spray plug 21 thereby forming a closure for the tubular chamber 15. Cap 22 is rovided with a central opening 23 and de ecting faces 24. 26 are a number of drilled openings through ca 22. 27 is a cap adapted to screw onto t e threaded end 14of branch 13 of casing 10, which cap is provided with a central and circular opening 28 and with lu 28 to facilitate screwing the same onto t e threaded part 14.

29 is a reduced portion of oil burner spindle 18, rejecting outside of the casing 10, and is t readed exteriorly to receive a needle valve 30 of standard construction, a spindle 31 of which controls a ort- 32 throu h which oil is admitted into duct 19 of spin 1e 18. supplied through a pipe 33.

The operation of the device is as follows Oil is admitted, as is usual with oil burners of this class, through supply pipe 33 and needle valve 30, whence it passes through duct 19 and through burner nozzle or spray plug 21 out at the front end of the burner, where it mixes with air under low pressure, forced into the casing 10 through ipe 12, which pipe is of relatively large diameter necessary to supply sufficient oxygen for perfect combustion. This air is deflected y means of cap 22 and more particularly faces 24 coacting with inner wall 27 of cap 27 towards the spray of oil issuing from spray plug 21.

Should it be desired to change the fuel from oil to gas, the oil control valve 30 is closed and the gas supply valve (not shown) is opened. Gas then passes through the pipe 17 into the chamber 15 whence it issues through the openings 26 of cap 22, out at the front end of the burner.

It is obvious that the oil and gas features of this burner are entirely independent of each other, and that the fuel can be instantly to the said gas chamber, a number of ports changed from oil togas should such exigency through said cap, and means,tindependent 30 occur. of the said -li uid fuelsupply pipe, to admit Should it be desirable to discharge an exgas to the sai gas chamber. traordinarily lar e volume of gas, it will be 2. In a burner of the class described, a noticed that by s ightly unscrewing the cenliquid fuel supply pipe extending through tral cap 22, opening 23 will serve as an auxthe burner, a gas chamber surrounding the 85 iliary gas passage or that urpose. said liquid fuel supply pipe, a spray plug It is understood that wh1 e we have above at the terminal of the liquid fuel supply described our invention as applied to one pipe, an adjustable cap serving'as a closure kind of burner of the low pressure ty e, its to the said gas chamber and contacting with use and application may be varied; an serve the said spray plug, the said adjustable cap 40 other kinds of burners as well. 1 being provided with a lar e central open- Various changes in the form, proportion ing and a number of smal er openings for and minor details of construction may be the purpose of dischar ing gas at the outlet resorted to without departing from the prinend of the burner, an; means at the outlet ciple or sacrificing an of the advantages of end of the burner to deflect air against the (8 the invention as deliiied in the appended jets of gas issuing from the openings of the claims. said ad ustable cap, beyond the outlet end What we claim as new, 1s: of the burner. 1. In a fuel burner of the low air pres- In testimony whereof we have hereunto sure, externally atomizing kind, a liquid set our hands In presepce of two subscribing 60 fuel supply pipe extending through the witnesses.

burner, a as chamber surrounding the said WILBUR W. STEVENSON. liquid fue supply pipe, a spray nozzle at OWEN H. BATHGATE. the terminal of the lquid fuel s ply pipe \Vitnesses: a cap contacting with and encl dsin the: B. B. Hnms, said spray nozzle and serving as a c osure O'rro S. Sonamrm'. 

